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<?php $r = new ReflectionFunction(function() {}); var_dump($r->isClosure());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OpqIH
function name:  (null)
number of ops:  11
compiled vars:  !0 = $r
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   NEW                                              $1      'ReflectionFunction'
          1        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FOpqIH%3A2%240'
          2        SEND_VAL_EX                                              ~2
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !0, $1
    3     5        INIT_FCALL                                               'var_dump'
          6        INIT_METHOD_CALL                                         !0, 'isClosure'
          7        DO_FCALL                                      0  $5      
          8        SEND_VAR                                                 $5
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FOpqIH%3A2%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OpqIH
function name:  {closure}
number of ops:  1
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E > > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FOpqIH%3A2%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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